摘要
以黄斑星天牛为主的杨树蛀干害虫其成虫在林间产卵扩散的数学模型,可用指教曲线的模式表述;杨树株行距与株虫口密度累积数之间的关系,可用logistic模式来描述。当杨树平均株行距为1.51m时,杨树受蛀干害虫危害最为严重,株行距在2m以上时,受害程度明显减轻。
Establishes a mathematical model of spawn spreading of stem borer in poplar forest by exponential curve. The relation between accumulative population on each tree(y) and spacing(x) can be expressed by Logistic curve. Where x= 1.51m, the damage was very serious; and where x>2m, the damage was remarkably decreased.
出处
《西北林学院学报》
CSCD
1992年第3期69-74,共6页
Journal of Northwest Forestry University
关键词
蛀干害虫
扩散
杨树
为害
防治
stem borer, spreading, mathematical model
